function checkAll(name, myname)
{
	itemlist = document.getElementsByName(name);
	var length = itemlist
	for(var i = 0; i < itemlist.length; i++)
	{
		myitem = document.getElementsByName(myname);
		if(myitem[0].checked == true)
		{
			itemlist[i].checked = true;	
		}
		else
		{
			itemlist[i].checked = false;	
		}
	}  
}